4 calls in 2 days. Anyone know who/what this is about?

The caller never leaves a message.  Today, they called while I was working and talked to my 13 year old. I'm told the lady asked for me by FULL name.  When my child told her I was at work, she said thank you and ended call.  Again no message was left concerning the reason for the call.  I'm on the national Do not Call list so this is very annoying.  I have missed calls from this number everyday with no messages why they are trying to contact me.